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In 1981 we made an experiment of human gait in level walking.
1981年我们进行了人体水平步行步态的实验。
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The dog is walking down the street, when he comes to a level crossing.
狗狗沿着街道走到了一个十字路口。
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The dog is walking down the street, when he comes to a level crossing.
狗狗沿着街道走到了一个十字路口。
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